icons not appears in some websites
In some websites(like yahoo) the icons not appear,instead there is a aquare symbol with two rows of letters in their place,as you an see in my image. I check the "Webpages can use their own fonts" from tab content-advanced,i clear the cash,temp files, and cokies mutiple times, i have enable as true the string" gfx.downloadable_fonts.enabled" from about:config of firefox,i have unistall by several unistallers the firefox,i deleted all folders with name" Mozilla",before install again the firefox,but nothing.I deactivate one by one my add-on,i tried safe mode , but nothing. Any idea ;
Chosen solution
I found that the problem generate when my windows firewall turn off and insstallled zone alarm firewall.Doing that i lost my wi-fi connection and i had to put manual ip and dns to my connection .Even so,when i unistalled zone alarm,the problem remains.The only solution was to restore my windows in previous state with no zone alarm firewall ,and installed another.Curius that other browser,based on firefox,like palemoon or qpzilla had no problem with the icons!
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That are character from the PUA Unicode range ([*]).
Special icons are usually supplied by a font that is downloaded from the server (@font-face) as you might see by little boxes that show the hex code of the characters instead. If you have a font installed that covers this Unicode range then you may see a real character and not the little box with the CSS code.
Make sure you allow pages to choose their own fonts.
- Options/Preferences -> Content : Fonts & Colors -> Advanced: [X] "Allow pages to choose their own fonts, instead of my selections above"
You can check the gfx.downloadable_fonts.enabled pref on the about:config page and make sure it is set to true (if necessary double-click the line to toggle its value to true).
Firefox 41+ will allow icon fonts that use PUA code points to work with the font setting in "Options/Preferences > Content > Advanced" disabled. When unsupported code points are used then you see the little boxes with the hex code.
Modified by cor-el
The string" browser.display.use_document_fonts"is set to 1 and "gfx.downloadable_fonts.enabled"is set to true.From menu-Options/Preferences -> Content : Fonts & Colors -> Advanced: it is ticked(x) the "Allow pages to choose their own fonts, instead of my selections above" ,but the problem still remains. Any suggestion;
You can check the Web Console (Firefox/Tools > Web Developer) for error messages about blocked and unsafe content. You can check the Network Monitor to see if content is blocked or otherwise fails to load.
You can use "Ctrl+F5" or "Ctrl+Shift+R" to reload the page and bypass the cache to generate a fresh log.
Chosen Solution
I found that the problem generate when my windows firewall turn off and insstallled zone alarm firewall.Doing that i lost my wi-fi connection and i had to put manual ip and dns to my connection .Even so,when i unistalled zone alarm,the problem remains.The only solution was to restore my windows in previous state with no zone alarm firewall ,and installed another.Curius that other browser,based on firefox,like palemoon or qpzilla had no problem with the icons!